diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index ce93b26a768..661583f84ca 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2012-01-31  Jakub Jelinek  <jakub@redhat.com>
+
+	PR bootstrap/52041
+	PR bootstrap/52039
+	PR target/51974
+	* ipa-prop.c (detect_type_change_1): Call ao_ref_init.
+
 2012-01-31  Richard Guenther  <rguenther@suse.de>
 
 	PR tree-optimization/51528
diff --git a/gcc/ipa-prop.c b/gcc/ipa-prop.c
index 17e3b4ffb17..6d76adbbfb6 100644
--- a/gcc/ipa-prop.c
+++ b/gcc/ipa-prop.c
@@ -1,5 +1,5 @@
 /* Interprocedural analyses.
-   Copyright (C) 2005, 2007, 2008, 2009, 2010, 2011
+   Copyright (C) 2005, 2007, 2008, 2009, 2010, 2011, 2012
    Free Software Foundation, Inc.
 
 This file is part of GCC.
@@ -442,13 +442,11 @@ detect_type_change_1 (tree arg, tree base, tree comp_type, gimple call,
   if (!flag_devirtualize || !gimple_vuse (call))
     return false;
 
-  ao.ref = arg;
+  ao_ref_init (&ao, arg);
   ao.base = base;
   ao.offset = offset;
   ao.size = POINTER_SIZE;
   ao.max_size = ao.size;
-  ao.ref_alias_set = -1;
-  ao.base_alias_set = -1;
 
   tci.offset = offset;
   tci.object = get_base_address (arg);